Poly(l-lactic acid) nonwoven fabric prepared by carbon dioxide laser-thinning method |
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Authors: | Akihiro Suzuki Yu Akaoka |
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Institution: | Interdisciplinary Graduate of School of Medicine and Engineering, University of Yamanashi, Takeda-4, Kofu 400-8511, Japan |
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Abstract: | Poly(l-lactic acid) (PLLA) nonwoven fabric was obtained by using a carbon dioxide laser-thinning method. The obtained PLLA nonwoven fabric was made of endless microfibers with a uniform diameter without droplets. The fiber diameter can be varied by controlling an airflow rate supplied to the air jet, a supplying speed of an original fiber into a laser-irradiating point, and laser intensity. When the microfiber prepared by irradiating the laser operated at a laser intensity of 66 W cm−2 to the original fiber supplied at Ss = 0.1 m min−1 was dragged at an airflow rate of 30 L min−1, the thinnest microfiber with an average diameter of 3.4 μm was obtained. The obtained microfiber had a degree of crystallinity of 45%, and the degree of crystal orientation of 84%. The existence of highly oriented crystallites suggests that a flow-induced crystallization occurred during the laser-thinning. |
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Keywords: | l-lactic acid)" target="_blank">Poly(l-lactic acid) Nonwoven fabric Carbon dioxide laser SEM |
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